Oral absorption of iron is notoriously unreliable,
best get someone to crucify you with rusty nails. That should do it.
(The Porcupine From Purgatory katsu revival trust, Sun 23 Jun 2024, 18:18, archived)

Supposedly if you cook with iron pans you ingest some that way
though I've not researched this claim.
( brb Learn Ukrainian and prepare for a referendum, Sun 23 Jun 2024, 21:40, archived)